The Historic Maryland Newspapers Project at the University of Maryland Libraries and DC Wikimedia (official page | Meetup group) will be hosting an edit-a-thon on Monday, 18 August 2014 focused on using the newspaper sources available through the Library of Congress's Chronicling America (official site | Wikipedia page) database.
Participants in this edit-a-thon will learn about the Library of Congress's online public domain newspaper resources. Presenters will include Chronicling America staff and National Digital Newspaper Project members. The organizer of the Summer of Monuments WikiProject will demonstrate how Chronicling America can be used to tell the stories of America's National Register Historic Places.
See https://en.wikipedia.org/wiki/Wikipedia:Meetup/DC/Chronicling_America#Post_Edit-a-thon_Report for a copy of the agenda.